more coming soon

Installing Moodle

http://moodle.org/

Free Moodle Hosting (with Moodle pre-installed for you)

These are not for real classes - they are too limited and slow for that, although you might get away with a small class.
Instead they are really for you to develop your Moodle skills.

http://ninehub.com/ - seems pretty good
http://www.gnomio.com - full of annoying ads., but, hey, it's free!